ระบบภูมิคุ้มกัน, ป้องกัน, การติดเชื้อ, แอนติบอดี, แผลอักเสบ, ที่ระบาด, หนาว, เชื้อโรค, ไข้, สุขภาพ, ไข้หวัดใหญ่
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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